Thanks for that, it's helpful to me while I still wait for an update on my AOS after doing my biometrics back in May.
Yeah, you can upload Unsolicited Evidence online, but I don't recall it saying that anywhere on any letters. I think I just came across it while clicking around in my USCIS account. Although I've not uploaded anything for a while, because I am just thinking I can take it all to interview anyway? Swings and roundabouts, I guess. Maybe it had more use during Covid when they were waiving interviews, providing there was substantial evidence?
Anyway, congrats to you and your family. I hope the rest of your journey goes smoothly!